I keep trying to burn a CD through Windows Media Player. I've done this before and have never encountered any problems but now every time I try to burn a CD a bubble pops up reading <<Windows Media Player cannot burn some of the files. To investigate the problem, click the icon next to the files in the burn list.>> I don't see any icon and I don't know why it can't burn the songs. Any suggestions please as to why it is doing this and what I need to do?